Bolzano Vieilletrasse is an NPC.
Hi, I'm the renowned Bolzano Vieilletrasse. You've probably heard about me already. I make all sorts of strange and useful things with bits and pieces of plants and animals. I'm working on a big project at the moment but with all that's been going on these last few days, I have to admit that my work has been on hold a fair bit.
His name appears to be a reference to the Bolzano-Weierstrass Theorem. "Vieille trace" means "old dirt."